C++ Funktionsdeklaration:
double GPS_Distanz(double dBreite1,double dLaenge1,double dBreite2,double _
  dLaenge2)	{
 
Aufruf in VB:
Public Declare Function GPS_Distanz Lib "GPS.dll" (ByVal dBreite1 As Double, _
  ByVal dLaenge1 As Double, ByVal dBreite2 As Double, ByVal dLaenge2 As Double) _
  As Double